Description

The derwin() function creates a subwindow within window orig, with the
specified number of lines and columns, and upper left corner positioned
at begin_x, begin_y relative to window orig. A pointer to the
new window structure is returned.

The newwin() function creates a new window with the specified number of
lines and columns and upper left corner positioned at begin_x, begin_y.
A pointer to the new window structure is returned. A
full-screen window can be created by calling newwin(0,0,0,0).

If the number of lines specified is zero, newwin() uses a default
value of LINES minus begin_y; if the number of columns specified is
zero, newwin() uses the default value of COLS minus begin_x.

The subwin() function creates a subwindow within window orig, with the specified
number of lines and columns, and upper left corner positioned at begin_x,
begin_y (relative to the physical screen, not to window orig). A pointer to
the new window structure is returned.

The original window and subwindow share character storage of the overlapping area
(each window maintains its own pointers, cursor location, and other items). This
means that characters and attributes are identical in overlapping areas regardless of
which window characters are written to.